How to start up Intel-based Mac in macOS Recovery
Restart your Mac using the apple logo on the top left corner or by using the power button if your computer is off.
Immediately press and hold one of the following key combinations until you see the startup screen:
Command-R: Start up from the built-in macOS Recovery System. Use this key combination to reinstall the latest macOS that was installed on your system, or to use the other apps in macOS Recovery.
Option-Command-R: Start up from macOS Recovery over the internet. Use this key combination to reinstall macOS and upgrade to the latest version of macOS that’s compatible with your Mac.
Option-Shift-Command-R: Start up from macOS Recovery over the internet. Use this key combination to reinstall the version of macOS that came with your Mac or the closest version that’s still available.
If you see a lock, enter the password for your Mac.
If you have multiple volumes on your disk, select the volume you want to recover, then click Next.
If requested, choose an administrator account, click Next, enter the password for the account, then click Continue.
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